2005 nissan sentra

Okay i'm just about fed up with this car. I had the thermostat and the head gaskets replaced, as well as the spark plugs but the check engine light won't go off. I thought it was my altenator, but I did the head light check* for that, but it's not the problem. I have a big trip this weekend and i want to be sure i'm safe.

*the check is simply this...while it is dark drive around the block and when no one else is behind you tap your brakes if the headlights dim severly it is your altenator and the car is pulling too much on the battery*

interesting check... perhaps start with what the problem is... other then the check engine light being on. if you live in the states drop by an autozone and have them read the codes. post the codes here when you get them.

Robert

interesting check... perhaps start with what the problem is... other then the check engine light being on. if you live in the states drop by an autozone and have them read the codes. post the codes here when you get them.

If the car is running fine give it no concern. for many vehicles the check-engine light comes on and won't go off. most of the time people take them to the shop. if the guy is honest he will tell you that all he had to do was reset the computer. but most of the time it will come back on after you drive it about a hunderd miles.
as long as its running fine, leave it alone. it's like my grandpaw said if it aint broke don't fix it. good-luck ray

1 Suggested Answer

the blown head gasket most likely damaged the oxygen sensors, and this is the cause of the check engine light, have a Kragen auto or Auto zone do a trouble code test, it is free. the oxygen sensors will not cause anything but slight increase in fuel consumption and of course that irritating light in the dash..

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Do you mean coolant is entering #1 cyl and when you removed spark plug,cranked eng, coolant came out? If that's the case cyl. head gasket/cracked head is the problem. Also you will need to determine what caused the failure,ie: radiator cooling fan inop, thermostat, low coolant level due to leak,or mileage.

you can go to any auto parts store and buy a haynes manual for your car. they are based on a complete teardown of vehicle, this manual will tell the torque ratings. for about 25.00 dollars.and much more. have a good day !

unfortunately these engines are known for this condition and for head gasket failure.with engine cold pressurize cooling system with spark plugs removed.look down into holes with flashlight after about ten minutes.....im betting youll see a puddle of coolant on piston...usually its cyl# 2 or 3.i cant think of any other possibility for system repeatedly airlocking other than a head gasket.good news they are probably one of the easier ones to replace.

i have a 2005 1.8 nissan sentra.i rplaced the radiator becuause it was leaking.so when i did i took it for a test drive and the needle went to hot then back down to middle ways between the C & H BACK IN FORTH.so i replaced the thermostat. now as far as i can tell it is staying in the middle of C & H. i can't feel no water though cerulating through the top or bottom hose of the radiator. so now that i told you what i done so far my question is???? ( my heater is not working in the car it is blowing out cold air & i left the car runnng for about 45 min. even took it up and down the road.still cold air.what do you think i need to do?????????? )

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

the blown head gasket most likely damaged the oxygen sensors, and this is the cause of the check engine light, have a Kragen auto or Auto zone do a trouble code test, it is free. the oxygen sensors will not cause anything but slight increase in fuel consumption and of course that irritating light in the dash..

well if the head gasket has been replaced you shouldnt smeel any coolant. But have you check your coolant hoses???? for leaks or any coolant on the driveway, when your car has been sitting there overnight!???